Many designs require that the power rails are enabled (and at shutdown disabled) in a certain sequence.
The controller voltage may have to be stablilised before the I/O voltage is activated, etc.
A lot of the development boards we use day-to-day have such a power management chip on-board. They are used for microcontrollers, FPGAs and many single board computers: Raspberry Pi uses one, the BeagleBone, several LaunchPads, Papilio FPGA boards...
Maybe, rscasny , you can ask IC suppliers if they are interested to run a RoadTest where such a solution can be validated?
It does not have to be an evaluation kit. The Road Test kit could be the raw IC, and the components you need to sense and switch rails?
